Preparation method of carbon black/polylactic acid composite wire for 3D printing

The invention discloses a preparation method of a carbon black/polylactic acid composite wire for 3D printing. The carbon black/polylactic acid composite wire is characterized by comprising the following components: polylactic acid, carbon black and an aluminate coupling agent, the preparation method comprises the following steps: (1) grinding carbon black, and drying the ground carbon black and polylactic acid to remove excessive moisture; (2) weighing the polylactic acid, the carbon black and the aluminate coupling agent dried in the step (1) according to the mass fraction ratio of 100 parts of polylactic acid, 10-20 parts of carbon black and 2 parts of the aluminate coupling agent, and mixing to obtain uniformly mixed carbon black/polylactic acid composite powder; and (3) putting the composite powder obtained in the step (2) into an extruder for extrusion molding to obtain the carbon black/polylactic acid composite wire. The preparation method has the following advantages that the prepared wire is safe and